<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue 2.6.10.js"></script>
</head>

<body>
    <div id="app">
        <input type="text" v-model="search">
        <button @click="type=2">升序</button>
        <button @click="type=1">降序</button>
        <button @click="type=0">默认</button>
        <ul>
            <li v-for="item in finallyPersons" :key="item.id">姓名:{{item.name}},年龄:{{item.age}}</li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    search: "",
                    type: 0,
                    persons: [
                        { id: "001", name: "周杰伦", age: 19 },
                        { id: "002", name: "陈奕迅", age: 25 },
                        { id: "003", name: "周杰", age: 39 },
                        { id: "004", name: "陈冠希", age: 7 },
                        { id: "005", name: "谢坤", age: 22 },
                        { id: "006", name: "杨坤", age: 14 },
                        { id: "007", name: "谢霆锋", age: 11 },
                    ],
                }
            },
            computed: {
                finallyPersons() {
                    const sortPersons = this.persons.filter(item => {
                        return item.name.includes(this.search)
                    })
                    // 方式一：
                    if(this.type === 0){
                        return sortPersons
                    }else if(this.type === 1){
                        return sortPersons.sort((a,b)=>{
                            return b.age - a.age
                        })
                    }else{
                        return sortPersons.sort((a,b)=>{
                            return a.age - b.age
                        })
                    }

                    // 方式二：
                    // switch (this.type) {
                    //     case 1:
                    //         return sortPersons.sort((a, b) => {
                    //             return b.age - a.age;
                    //         });
                    //     case 2:
                    //         return sortPersons.sort((a, b) => {
                    //             return a.age - b.age;
                    //         });
                    //     default:
                    //         return sortPersons;
                    // }
                }
            }
        })
    </script>
</body>

</html>